Spots before your eyes-or, indeed Sun spots? One of the larger explosions occured on the Sun a few years ago, and NASA was there to gather a few picures, and some data of this event. The amout of energy released is incredible-now, if we can put some in our electrial grids, or better cars-great!

http://science.nasa.gov/headlines/y2007/24apr_hubble4sun.htm